Błąd z biblioteką c++ builder

Proszę o pomoc, zaznaczyłem na czerwono gdzie jest błąd. Nie wykrywa biblioteki fstream.

I jeszcze jedno, jak ustawić żeby plik miał różną nazwę w zależności od zmiennej nazwa_save ?

//---------------------------------------------------------------------------

#include <vcl.h>
#include <fstream>
#include <iostream>
#pragma hdrstop

#include "Unit1.h"
#include "Unit2.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------


void __fastcall TForm1::Button1Click(TObject *Sender)
{
   if (Button1->Visible==true)
   {
   Button1->Visible=false;
   Button2->Visible=false;
   Button3->Visible=false;
   Button4->Visible=true;
   Button5->Visible=true;
   Button6->Visible=true;
   }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
   if (Button2->Visible==true)
   {
   Button1->Visible=false;
   Button2->Visible=false;
   Button3->Visible=false;
   Button4->Visible=true;
   }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button3Click(TObject *Sender)
{
   Form1->Close();
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button4Click(TObject *Sender)
{
   if (Button1->Visible==false || Button2->Visible==false)
   {
   Button1->Visible=true;
   Button2->Visible=true;
   Button3->Visible=true;
   Button4->Visible=false;
   Button6->Visible=false;
   Button5->Visible=false;
   Button7->Visible=false;
   Edit1->Visible=false;
   Label2->Visible=false;
   }
}
//---------------------------------------------------------------------------


void __fastcall TForm1::Button6Click(TObject *Sender)
{
   Edit1->Visible=true;
   Label2->Visible=true;
   Button5->Visible=false;
   Button6->Visible=false;
   Button7->Visible=true;


}
//---------------------------------------------------------------------------


void __fastcall TForm1::Button7Click(TObject *Sender)
{
   fstream nazwa_save;
   nazwa_save.open("Save/tx.txt");
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Edit1Change(TObject *Sender)
{
   AnsiString nazwa_save;
   nazwa_save=Edit1->Text;
}
//---------------------------------------------------------------------------